Hun Sen berated journalists on Sunday at a dinner his government hosted for correspondents and accused some of spreading fabricated stories.
China supports Cambodia's efforts to protect political stability and believes it will smoothly hold elections next year.
Cambodia's parliament voted to change party laws on Monday to re-distribute seats if a party is dissolved after the government filed a lawsuit.
A royalist political party aligned with Cambodian Prime Minister said it was filing a lawsuit to demand the dissolution of Cambodia's main opposition party.
Hundreds of thousands of Catalans are expected to rally in the streets of Barcelona on Monday.